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impl get and create

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This commit is contained in:
Jason Hall 2021-09-09 13:13:19 -04:00
parent a09c449fd7
commit f6db51af0f
1 changed files with 46 additions and 1 deletions
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47
main.go
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@ -6,6 +6,7 @@ import (
"context"
"log"
"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/client-go/dynamic"
@ -22,6 +23,7 @@ func main() {
log.Fatalf("ClientConfig: %v", err)
}
// List pods in kube-system.
pods, err := NewClient[pod](config).List(ctx, "kube-system")
if err != nil { log.Fatal("listing pods:", err) }
log.Println("PODS")
@ -29,7 +31,19 @@ func main() {
log.Println("-", p.Name)
}
cms, err := NewClient[cm](config).List(ctx, "kube-system")
// Create a ConfigMap, then list ConfigMaps.
cmc := NewClient[cm](config)
if err := cmc.Create(ctx, "kube-system",cm{
ObjectMeta: metav1.ObjectMeta{
GenerateName: "foo-",
},
Data: map[string]string{
"hello": "world",
},
}); err != nil {
log.Fatal("creating configmap:", err)
}
cms, err := cmc.List(ctx, "kube-system")
if err != nil { log.Fatal("listing configmaps:", err) }
log.Println("CONFIGMAPS")
for _, cm := range cms {
@ -64,6 +78,37 @@ func (c client[T]) List(ctx context.Context, namespace string) ([]T, error) {
return out, nil
}
func (c client[T]) Get(ctx context.Context, namespace, name string) (*T, error) {
var t T
u, err := c.dyn.Resource(t.GVR()).Namespace(namespace).Get(ctx, name, metav1.GetOptions{})
if err != nil {
return nil, err
}
var buf bytes.Buffer
if err := json.NewEncoder(&buf).Encode(u.Object); err != nil { return nil, err }
if err := json.NewDecoder(&buf).Decode(&t); err != nil { return nil, err }
return &t, nil
}
func (c client[T]) Create(ctx context.Context, namespace string, t T) error {
m := map[string]interface{}{}
var buf bytes.Buffer
if err := json.NewEncoder(&buf).Encode(t); err != nil { return err }
if err := json.NewDecoder(&buf).Decode(&m); err != nil { return err }
u := &unstructured.Unstructured{Object:m}
_, err := c.dyn.Resource(t.GVR()).Namespace(namespace).Create(ctx, u, metav1.CreateOptions{})
return err
}
// THESE ARE HACKS
//
// Ideally, the Pod type (or any runtime.Object) would be able to give us its
// GVR directly, then the obj interface / type constraint would just be
// runtime.Object.
//
// Since it can't, we have to wrap runtime.Object and provide these per-type.
// This would be really nice to fix.
type pod corev1.Pod
func (pod pod) GetObjectKind() schema.ObjectKind { return pod.GetObjectKind() }
func (pod pod) DeepCopyObject() runtime.Object { return pod.DeepCopyObject() }